⚡ Bolt: 파일 시스템 순회 성능 최적화 (readdirSync)

[seonghobae]

💡 What: src/files.ts의 walkFiles 함수 내에서 readdirSync 사용 시 { withFileTypes: true } 옵션을 추가하여 fs.Dirent를 반환하도록 하고 불필요한 statSync 호출을 제거했습니다.
🎯 Why: 기존 코드는 파일 트리를 순회할 때마다 각 항목에 대해 개별적으로 동기식 블로킹 호출인 statSync를 실행하여 심각한 I/O 성능 저하를 유발했습니다.
📊 Impact: 특히 파일 개수가 많은 대규모 프로젝트 디렉토리에서 I/O 병목을 현저히 줄여 실행 속도를 높이고 메모리/시간 소모를 줄입니다.
🔬 Measurement: pnpm test 명령어를 통해 최적화 후에도 파일시스템 순회 로직이 기존과 동일하게 정확히 동작함을 검증할 수 있습니다.

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PR created automatically by Jules for task 4255213065619638732 started by @seonghobae

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